Here are the characters who give you Pokemon in SoulSilver:
* Professor Elm: Gives you your starter Pokemon (Chikorita, Cyndaquil, or Totodile).
* Professor Oak: Gives you a starter Pokemon (Bulbasaur, Charmander, or Squirtle) after you defeat the Elite Four.
* Mr. Pokemon: Gives you a Mankey in the Goldenrod Department Store.
* Falkner: Gives you a Pidgey after you defeat him.
* Whitney: Gives you a Clefairy after you defeat her.
* Bugsy: Gives you a Scyther after you defeat him.
* Morty: Gives you a Ghastly after you defeat him.
* Chuck: Gives you a Poliwhirl after you defeat him.
* Jasmine: Gives you a Steelix after you defeat her.
* Pryce: Gives you a Seel after you defeat him.
* Clair: Gives you a Dragonair after you defeat her.
* Koga: Gives you a Koffing after you defeat him.
* Bruno: Gives you a Hitmontop after you defeat him.
* Karen: Gives you a Umbreon after you defeat her.
* Lance: Gives you a Dragonite after you defeat him.
While Steven isn't a Pokemon giver, he is a great character in the story and a valuable ally in your journey.